<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .content1{
      height: 30px;
      width: 30px;
      background-color: red;
      margin-bottom: 10px;
      float: left;
    }
    .content2{
      height: 30px;
      width: 30px;
      background-color: black;
      float: left;
    }
  </style>
</head>
<body>
  <div class="content1"></div>
  <div class="content2"></div>
</body>
</html>